From d8899ed6d847f1cf0b6749c1b2c855833d6b3ebf Mon Sep 17 00:00:00 2001
From: Utkarsh <utkarshpawadecse@gmail.com>
Date: Fri, 10 Apr 2026 11:01:03 +0530
Subject: [PATCH 1/5] Fix legend border artifact in ppc_freqpoly and
 ppc_freqpoly_grouped

---
 NEWS.md               | 1 +
 R/ppc-distributions.R | 1 +
 2 files changed, 2 insertions(+)

diff --git a/NEWS.md b/NEWS.md
index fceb6a8f..2af3705f 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,6 @@
 # bayesplot (development version)
 
+* Fixed legend border artifact in `ppc_freqpoly()` and `ppc_freqpoly_grouped()`.
 * `ppc_ecdf_overlay()`, `ppc_ecdf_overlay_grouped()`, and `ppd_ecdf_overlay()` now always use `geom_step()`. The `discrete` argument is deprecated.
 * Fixed missing `drop = FALSE` in `nuts_params.CmdStanMCMC()`.
 * Replace `apply()` with `storage.mode()` for integer-to-numeric matrix conversion in `validate_predictions()`.
diff --git a/R/ppc-distributions.R b/R/ppc-distributions.R
index 7ab9ffb8..8b988074 100644
--- a/R/ppc-distributions.R
+++ b/R/ppc-distributions.R
@@ -468,6 +468,7 @@ ppc_freqpoly <-
       ) +
       scale_fill_ppc() +
       scale_color_ppc() +
+      guides(fill = guide_legend(override.aes = list(color = NA))) +
       facet_wrap_parsed("rep_label") +
       bayesplot_theme_get() +
       force_axes_in_facets() +

From 546f608ed6b615fd7b88a12e865149916425d91d Mon Sep 17 00:00:00 2001
From: Utkarsh <utkarshpawadecse@gmail.com>
Date: Fri, 10 Apr 2026 11:18:58 +0530
Subject: [PATCH 2/5] Update vdiffr snapshots for ppc_freqpoly legend fix

---
 .../ppc-distributions/ppc-freqpoly-alpha-binwidth-size.svg    | 4 ++--
 .../_snaps/ppc-distributions/ppc-freqpoly-default.svg         | 4 ++--
 .../_snaps/ppc-distributions/ppc-freqpoly-grouped-default.svg | 4 ++--
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-alpha-binwidth-size.svg b/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-alpha-binwidth-size.svg
index 5fb2acd0..95851dd4 100644
--- a/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-alpha-binwidth-size.svg
+++ b/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-alpha-binwidth-size.svg
@@ -172,9 +172,9 @@
 <polyline points='5.98,371.78 5.98,209.12 ' style='stroke-width: 0.85; stroke-linecap: butt;' />
 <polyline points='5.98,556.04 5.98,393.38 ' style='stroke-width: 0.85; stroke-linecap: butt;' />
 <rect x='664.10' y='281.53' width='17.28' height='17.28' style='stroke-width: 2.33; stroke: #FFFFFF; fill: #FFFFFF;' />
-<rect x='666.93' y='284.37' width='11.61' height='11.61' style='stroke-width: 4.27; stroke: #011F4B; stroke-linecap: butt; fill: #03396C; fill-opacity: 0.10;' />
+<rect x='666.93' y='284.37' width='11.61' height='11.61' style='stroke-width: 4.27; stroke: none; stroke-linecap: butt; fill: #03396C; fill-opacity: 0.10;' />
 <rect x='664.10' y='298.81' width='17.28' height='17.28' style='stroke-width: 2.33; stroke: #FFFFFF; fill: #FFFFFF;' />
-<rect x='666.93' y='301.65' width='11.61' height='11.61' style='stroke-width: 4.27; stroke: #B3CDE0; stroke-linecap: butt; fill: #D1E1EC; fill-opacity: 0.10;' />
+<rect x='666.93' y='301.65' width='11.61' height='11.61' style='stroke-width: 4.27; stroke: none; stroke-linecap: butt; fill: #D1E1EC; fill-opacity: 0.10;' />
 <text x='687.36' y='292.26' style='font-size: 13.00px; font-style: italic; font-family: sans;' textLength='6.51px' lengthAdjust='spacingAndGlyphs'>y</text>
 <text x='687.36' y='308.74' style='font-size: 13.00px; font-style: italic; font-family: sans;' textLength='6.51px' lengthAdjust='spacingAndGlyphs'>y</text>
 <text x='694.89' y='311.15' style='font-size: 9.10px; font-family: sans;' textLength='3.03px' lengthAdjust='spacingAndGlyphs'>r</text>
diff --git a/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-default.svg b/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-default.svg
index 7bbb5856..d45966b0 100644
--- a/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-default.svg
+++ b/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-default.svg
@@ -160,9 +160,9 @@
 <polyline points='5.98,371.78 5.98,209.12 ' style='stroke-width: 0.85; stroke-linecap: butt;' />
 <polyline points='5.98,556.04 5.98,393.38 ' style='stroke-width: 0.85; stroke-linecap: butt;' />
 <rect x='664.10' y='281.53' width='17.28' height='17.28' style='stroke-width: 2.33; stroke: #FFFFFF; fill: #FFFFFF;' />
-<rect x='664.81' y='282.24' width='15.86' height='15.86' style='stroke-width: 1.07; stroke: #011F4B; stroke-linecap: butt; fill: #03396C;' />
+<rect x='664.81' y='282.24' width='15.86' height='15.86' style='stroke-width: 1.07; stroke: none; stroke-linecap: butt; fill: #03396C;' />
 <rect x='664.10' y='298.81' width='17.28' height='17.28' style='stroke-width: 2.33; stroke: #FFFFFF; fill: #FFFFFF;' />
-<rect x='664.81' y='299.52' width='15.86' height='15.86' style='stroke-width: 1.07; stroke: #B3CDE0; stroke-linecap: butt; fill: #D1E1EC;' />
+<rect x='664.81' y='299.52' width='15.86' height='15.86' style='stroke-width: 1.07; stroke: none; stroke-linecap: butt; fill: #D1E1EC;' />
 <text x='687.36' y='292.26' style='font-size: 13.00px; font-style: italic; font-family: sans;' textLength='6.51px' lengthAdjust='spacingAndGlyphs'>y</text>
 <text x='687.36' y='308.74' style='font-size: 13.00px; font-style: italic; font-family: sans;' textLength='6.51px' lengthAdjust='spacingAndGlyphs'>y</text>
 <text x='694.89' y='311.15' style='font-size: 9.10px; font-family: sans;' textLength='3.03px' lengthAdjust='spacingAndGlyphs'>r</text>
diff --git a/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-grouped-default.svg b/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-grouped-default.svg
index 9baeaf05..25d69476 100644
--- a/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-grouped-default.svg
+++ b/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-grouped-default.svg
@@ -355,9 +355,9 @@
 <polyline points='5.98,420.59 5.98,306.74 ' style='stroke-width: 0.85; stroke-linecap: butt;' />
 <polyline points='5.98,556.04 5.98,442.19 ' style='stroke-width: 0.85; stroke-linecap: butt;' />
 <rect x='664.10' y='287.03' width='17.28' height='17.28' style='stroke-width: 2.33; stroke: #FFFFFF; fill: #FFFFFF;' />
-<rect x='664.81' y='287.73' width='15.86' height='15.86' style='stroke-width: 1.07; stroke: #011F4B; stroke-linecap: butt; fill: #03396C;' />
+<rect x='664.81' y='287.73' width='15.86' height='15.86' style='stroke-width: 1.07; stroke: none; stroke-linecap: butt; fill: #03396C;' />
 <rect x='664.10' y='304.31' width='17.28' height='17.28' style='stroke-width: 2.33; stroke: #FFFFFF; fill: #FFFFFF;' />
-<rect x='664.81' y='305.01' width='15.86' height='15.86' style='stroke-width: 1.07; stroke: #B3CDE0; stroke-linecap: butt; fill: #D1E1EC;' />
+<rect x='664.81' y='305.01' width='15.86' height='15.86' style='stroke-width: 1.07; stroke: none; stroke-linecap: butt; fill: #D1E1EC;' />
 <text x='687.36' y='297.75' style='font-size: 13.00px; font-style: italic; font-family: sans;' textLength='6.51px' lengthAdjust='spacingAndGlyphs'>y</text>
 <text x='687.36' y='314.23' style='font-size: 13.00px; font-style: italic; font-family: sans;' textLength='6.51px' lengthAdjust='spacingAndGlyphs'>y</text>
 <text x='694.89' y='316.64' style='font-size: 9.10px; font-family: sans;' textLength='3.03px' lengthAdjust='spacingAndGlyphs'>r</text>

From 4a4e1765bb65ea222d4ea3ba4984af67d76fb697 Mon Sep 17 00:00:00 2001
From: Utkarsh <utkarshpawadecse@gmail.com>
Date: Fri, 10 Apr 2026 11:27:25 +0530
Subject: [PATCH 3/5] Also override alpha in legend keys for low-alpha freqpoly
 plots

---
 R/ppc-distributions.R                                         | 2 +-
 .../ppc-distributions/ppc-freqpoly-alpha-binwidth-size.svg    | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/R/ppc-distributions.R b/R/ppc-distributions.R
index 8b988074..2456a0d1 100644
--- a/R/ppc-distributions.R
+++ b/R/ppc-distributions.R
@@ -468,7 +468,7 @@ ppc_freqpoly <-
       ) +
       scale_fill_ppc() +
       scale_color_ppc() +
-      guides(fill = guide_legend(override.aes = list(color = NA))) +
+      guides(fill = guide_legend(override.aes = list(color = NA, alpha = 1))) +
       facet_wrap_parsed("rep_label") +
       bayesplot_theme_get() +
       force_axes_in_facets() +
diff --git a/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-alpha-binwidth-size.svg b/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-alpha-binwidth-size.svg
index 95851dd4..dac801a5 100644
--- a/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-alpha-binwidth-size.svg
+++ b/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-alpha-binwidth-size.svg
@@ -172,9 +172,9 @@
 <polyline points='5.98,371.78 5.98,209.12 ' style='stroke-width: 0.85; stroke-linecap: butt;' />
 <polyline points='5.98,556.04 5.98,393.38 ' style='stroke-width: 0.85; stroke-linecap: butt;' />
 <rect x='664.10' y='281.53' width='17.28' height='17.28' style='stroke-width: 2.33; stroke: #FFFFFF; fill: #FFFFFF;' />
-<rect x='666.93' y='284.37' width='11.61' height='11.61' style='stroke-width: 4.27; stroke: none; stroke-linecap: butt; fill: #03396C; fill-opacity: 0.10;' />
+<rect x='666.93' y='284.37' width='11.61' height='11.61' style='stroke-width: 4.27; stroke: none; stroke-linecap: butt; fill: #03396C;' />
 <rect x='664.10' y='298.81' width='17.28' height='17.28' style='stroke-width: 2.33; stroke: #FFFFFF; fill: #FFFFFF;' />
-<rect x='666.93' y='301.65' width='11.61' height='11.61' style='stroke-width: 4.27; stroke: none; stroke-linecap: butt; fill: #D1E1EC; fill-opacity: 0.10;' />
+<rect x='666.93' y='301.65' width='11.61' height='11.61' style='stroke-width: 4.27; stroke: none; stroke-linecap: butt; fill: #D1E1EC;' />
 <text x='687.36' y='292.26' style='font-size: 13.00px; font-style: italic; font-family: sans;' textLength='6.51px' lengthAdjust='spacingAndGlyphs'>y</text>
 <text x='687.36' y='308.74' style='font-size: 13.00px; font-style: italic; font-family: sans;' textLength='6.51px' lengthAdjust='spacingAndGlyphs'>y</text>
 <text x='694.89' y='311.15' style='font-size: 9.10px; font-family: sans;' textLength='3.03px' lengthAdjust='spacingAndGlyphs'>r</text>

From 7897fe2698ced3f23e170694fd0ed05f0f6eab2a Mon Sep 17 00:00:00 2001
From: Utkarsh <utkarshpawadecse@gmail.com>
Date: Wed, 15 Apr 2026 17:20:46 +0530
Subject: [PATCH 4/5] drop alpha=1 from legend override

---
 R/ppc-distributions.R                                         | 2 +-
 .../ppc-distributions/ppc-freqpoly-alpha-binwidth-size.svg    | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/R/ppc-distributions.R b/R/ppc-distributions.R
index 2456a0d1..8b988074 100644
--- a/R/ppc-distributions.R
+++ b/R/ppc-distributions.R
@@ -468,7 +468,7 @@ ppc_freqpoly <-
       ) +
       scale_fill_ppc() +
       scale_color_ppc() +
-      guides(fill = guide_legend(override.aes = list(color = NA, alpha = 1))) +
+      guides(fill = guide_legend(override.aes = list(color = NA))) +
       facet_wrap_parsed("rep_label") +
       bayesplot_theme_get() +
       force_axes_in_facets() +
diff --git a/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-alpha-binwidth-size.svg b/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-alpha-binwidth-size.svg
index dac801a5..95851dd4 100644
--- a/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-alpha-binwidth-size.svg
+++ b/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-alpha-binwidth-size.svg
@@ -172,9 +172,9 @@
 <polyline points='5.98,371.78 5.98,209.12 ' style='stroke-width: 0.85; stroke-linecap: butt;' />
 <polyline points='5.98,556.04 5.98,393.38 ' style='stroke-width: 0.85; stroke-linecap: butt;' />
 <rect x='664.10' y='281.53' width='17.28' height='17.28' style='stroke-width: 2.33; stroke: #FFFFFF; fill: #FFFFFF;' />
-<rect x='666.93' y='284.37' width='11.61' height='11.61' style='stroke-width: 4.27; stroke: none; stroke-linecap: butt; fill: #03396C;' />
+<rect x='666.93' y='284.37' width='11.61' height='11.61' style='stroke-width: 4.27; stroke: none; stroke-linecap: butt; fill: #03396C; fill-opacity: 0.10;' />
 <rect x='664.10' y='298.81' width='17.28' height='17.28' style='stroke-width: 2.33; stroke: #FFFFFF; fill: #FFFFFF;' />
-<rect x='666.93' y='301.65' width='11.61' height='11.61' style='stroke-width: 4.27; stroke: none; stroke-linecap: butt; fill: #D1E1EC;' />
+<rect x='666.93' y='301.65' width='11.61' height='11.61' style='stroke-width: 4.27; stroke: none; stroke-linecap: butt; fill: #D1E1EC; fill-opacity: 0.10;' />
 <text x='687.36' y='292.26' style='font-size: 13.00px; font-style: italic; font-family: sans;' textLength='6.51px' lengthAdjust='spacingAndGlyphs'>y</text>
 <text x='687.36' y='308.74' style='font-size: 13.00px; font-style: italic; font-family: sans;' textLength='6.51px' lengthAdjust='spacingAndGlyphs'>y</text>
 <text x='694.89' y='311.15' style='font-size: 9.10px; font-family: sans;' textLength='3.03px' lengthAdjust='spacingAndGlyphs'>r</text>

From 7ea83e9865afd02dda0d7e6185a5c4d6ab2fca2c Mon Sep 17 00:00:00 2001
From: jgabry <jgabry@gmail.com>
Date: Wed, 15 Apr 2026 15:01:24 -0600
Subject: [PATCH 5/5] Fix merge conflicts

---
 .../ppc-distributions/ppc-freqpoly-alpha-binwidth-size.svg    | 4 ++--
 .../_snaps/ppc-distributions/ppc-freqpoly-default.svg         | 4 ++--
 .../_snaps/ppc-distributions/ppc-freqpoly-grouped-default.svg | 4 ++--
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-alpha-binwidth-size.svg b/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-alpha-binwidth-size.svg
index 6b4bd675..6b46679f 100644
--- a/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-alpha-binwidth-size.svg
+++ b/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-alpha-binwidth-size.svg
@@ -172,9 +172,9 @@
 <polyline points='5.98,371.78 5.98,209.12 ' style='stroke-width: 0.85; stroke-linecap: butt;' />
 <polyline points='5.98,556.04 5.98,393.38 ' style='stroke-width: 0.85; stroke-linecap: butt;' />
 <rect x='664.10' y='273.17' width='17.28' height='17.28' style='stroke-width: 2.33; stroke: #FFFFFF; fill: #FFFFFF;' />
-<rect x='666.93' y='276.00' width='11.61' height='11.61' style='stroke-width: 4.27; stroke: #011F4B; stroke-linecap: butt; fill: #03396C; fill-opacity: 0.10;' />
+<rect x='666.93' y='276.00' width='11.61' height='11.61' style='stroke-width: 4.27; stroke: none; stroke-linecap: butt; fill: #03396C; fill-opacity: 0.10;' />
 <rect x='664.10' y='290.45' width='17.28' height='17.28' style='stroke-width: 2.33; stroke: #FFFFFF; fill: #FFFFFF;' />
-<rect x='666.93' y='293.28' width='11.61' height='11.61' style='stroke-width: 4.27; stroke: #B3CDE0; stroke-linecap: butt; fill: #D1E1EC; fill-opacity: 0.10;' />
+<rect x='666.93' y='293.28' width='11.61' height='11.61' style='stroke-width: 4.27; stroke: none; stroke-linecap: butt; fill: #D1E1EC; fill-opacity: 0.10;' />
 <text x='687.36' y='283.90' style='font-size: 13.00px; font-style: italic; font-family: sans;' textLength='6.51px' lengthAdjust='spacingAndGlyphs'>y</text>
 <text x='687.36' y='300.38' style='font-size: 13.00px; font-style: italic; font-family: sans;' textLength='6.51px' lengthAdjust='spacingAndGlyphs'>y</text>
 <text x='694.89' y='302.78' style='font-size: 9.10px; font-family: sans;' textLength='3.03px' lengthAdjust='spacingAndGlyphs'>r</text>
diff --git a/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-default.svg b/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-default.svg
index aa45b98a..d99e44dd 100644
--- a/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-default.svg
+++ b/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-default.svg
@@ -160,9 +160,9 @@
 <polyline points='5.98,371.78 5.98,209.12 ' style='stroke-width: 0.85; stroke-linecap: butt;' />
 <polyline points='5.98,556.04 5.98,393.38 ' style='stroke-width: 0.85; stroke-linecap: butt;' />
 <rect x='664.10' y='273.17' width='17.28' height='17.28' style='stroke-width: 2.33; stroke: #FFFFFF; fill: #FFFFFF;' />
-<rect x='664.81' y='273.88' width='15.86' height='15.86' style='stroke-width: 1.07; stroke: #011F4B; stroke-linecap: butt; fill: #03396C;' />
+<rect x='664.81' y='273.88' width='15.86' height='15.86' style='stroke-width: 1.07; stroke: none; stroke-linecap: butt; fill: #03396C;' />
 <rect x='664.10' y='290.45' width='17.28' height='17.28' style='stroke-width: 2.33; stroke: #FFFFFF; fill: #FFFFFF;' />
-<rect x='664.81' y='291.16' width='15.86' height='15.86' style='stroke-width: 1.07; stroke: #B3CDE0; stroke-linecap: butt; fill: #D1E1EC;' />
+<rect x='664.81' y='291.16' width='15.86' height='15.86' style='stroke-width: 1.07; stroke: none; stroke-linecap: butt; fill: #D1E1EC;' />
 <text x='687.36' y='283.90' style='font-size: 13.00px; font-style: italic; font-family: sans;' textLength='6.51px' lengthAdjust='spacingAndGlyphs'>y</text>
 <text x='687.36' y='300.38' style='font-size: 13.00px; font-style: italic; font-family: sans;' textLength='6.51px' lengthAdjust='spacingAndGlyphs'>y</text>
 <text x='694.89' y='302.78' style='font-size: 9.10px; font-family: sans;' textLength='3.03px' lengthAdjust='spacingAndGlyphs'>r</text>
diff --git a/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-grouped-default.svg b/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-grouped-default.svg
index aa820572..0ced8561 100644
--- a/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-grouped-default.svg
+++ b/tests/testthat/_snaps/ppc-distributions/ppc-freqpoly-grouped-default.svg
@@ -355,9 +355,9 @@
 <polyline points='5.98,420.59 5.98,306.74 ' style='stroke-width: 0.85; stroke-linecap: butt;' />
 <polyline points='5.98,556.04 5.98,442.19 ' style='stroke-width: 0.85; stroke-linecap: butt;' />
 <rect x='664.10' y='278.66' width='17.28' height='17.28' style='stroke-width: 2.33; stroke: #FFFFFF; fill: #FFFFFF;' />
-<rect x='664.81' y='279.37' width='15.86' height='15.86' style='stroke-width: 1.07; stroke: #011F4B; stroke-linecap: butt; fill: #03396C;' />
+<rect x='664.81' y='279.37' width='15.86' height='15.86' style='stroke-width: 1.07; stroke: none; stroke-linecap: butt; fill: #03396C;' />
 <rect x='664.10' y='295.94' width='17.28' height='17.28' style='stroke-width: 2.33; stroke: #FFFFFF; fill: #FFFFFF;' />
-<rect x='664.81' y='296.65' width='15.86' height='15.86' style='stroke-width: 1.07; stroke: #B3CDE0; stroke-linecap: butt; fill: #D1E1EC;' />
+<rect x='664.81' y='296.65' width='15.86' height='15.86' style='stroke-width: 1.07; stroke: none; stroke-linecap: butt; fill: #D1E1EC;' />
 <text x='687.36' y='289.39' style='font-size: 13.00px; font-style: italic; font-family: sans;' textLength='6.51px' lengthAdjust='spacingAndGlyphs'>y</text>
 <text x='687.36' y='305.87' style='font-size: 13.00px; font-style: italic; font-family: sans;' textLength='6.51px' lengthAdjust='spacingAndGlyphs'>y</text>
 <text x='694.89' y='308.28' style='font-size: 9.10px; font-family: sans;' textLength='3.03px' lengthAdjust='spacingAndGlyphs'>r</text>